Patent US4424086A successfully refreshed from Google Patents.
US4424086A
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Pyrotechnic compositions for severing conduits
Assignee: Halliburton Co
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Filing: 1982-07-06
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Granted: 1984-01-03
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Expires: 2002-07-06
Abstract
Abstract A stacked load of gas-forming pyrotechnic fuel pellets comprising metal, metal oxide and PTFE in varying amounts for use in apparatus for severing conduits in high pressure environments.
Inventors
- 👤 Glenn B. Christopher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:59
CPC Classifications
E; E21; E21B; E21B29/00; E21B29/02; C; C06; C06B; C06B33/00; C06B33/02; F; F42; F42D; F42D3/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
108 words
A gas-forming pyrotechnic fuel composition load for use in apparatus for severing conduits in high pressure environments comprising a plurality of stacked fuel pellets of a mixture of (a) a metal selected from the group consisting of aluminum, magnesium, niobium, titanium and mixtures thereof, (b) a metal oxide selected from the group consisting of ferric oxide, ferrous oxide, ferrosoferric oxide, cupric oxide, chromium trioxide and mixtures thereof, and (c) a gas-forming component which vaporizes to form a gas when heated to the temperature at which said metal and said metal oxide react when ignited wherein alternate fuel pellets of said load have alternate amounts of said gas-forming component.
Claim 2
Dependent Claim
108 words
A gas-forming pyrotechnic fuel composition load for use in apparatus for severing conduits in high pressure environments comprising a plurality of stacked fuel pellets of a mixture of (a) a metal selected from the group consisting of aluminum, magnesium, niobium, titanium and mixtures thereof, (b) a metal oxide selected from the group consisting of ferric oxide, ferrous oxide, ferrosoferric oxide, cupric oxide, chromium trioxide and mixtures thereof, and (c) a gas-forming component which vaporizes to form a gas when heated to the temperature at which said metal and said metal oxide react when ignited wherein alternate fuel pellets of said load have alternate amounts of said gas-forming component.
Claim 3
Dependent Claim
27 words
The fuel composition load of claim 1 wherein the first fuel pellet in the stacked load has less gas-forming component therein than the next adjacent fuel pellet.
Claim 4
Dependent Claim
13 words
The fuel composition load of claim 2 wherein said gas-forming component is polytetrafluoroethylene.
Claim 5
Dependent Claim
30 words
The fuel composition load of claim 3 wherein said metal is aluminum and said metal oxide is selected from the group consisting of ferric oxide, cupric oxide and mixtures thereof.
Claim 6
Dependent Claim
32 words
The fuel composition load of claim 4 wherein aluminum is present in said composition in an amount in the range of from about 8% to about 70% by weight of said composition.
Claim 7
Dependent Claim
34 words
The fuel composition load of claim 5 wherein said metal oxide is present in said composition in an amount in the range of from about 12% to about 80% by weight of said composition.
Claim 8
Dependent Claim
32 words
The composition load of claim 6 wherein said polytetrafluoroethylene is present in said composition in an amount in the range of from about 1% to about 60% by weight of said composition.
Claim 9
Dependent Claim
62 words
The fuel composition load of claim 2 wherein said first fuel pellet comprises aluminum present therein in an amount of about 25.5% by weight, a metal oxide selected from the group consisting of ferric oxide, cupric oxide and mixtures thereof present therein in an amount of about 59.5% by weight and polytetrafluoroethylene present therein in an amount of about 15% by weight.
Claim 10
Dependent Claim
63 words
The fuel composition load of claim 8 wherein said next adjacent fuel pellet comprises aluminum present therein in an amount of about 7.5% by weight, a metal oxide selected from the group consisting of ferric oxide, cupric oxide and mixtures thereof present therein in an amount of about 17.5% by weight and polytetrafluoroethylene present therein in an amount of about 75% by weight.
Claim 11
Dependent Claim
32 words
The fuel composition load of claim 9 wherein each of said fuel pellets is annular in shape and the central opening in said pellets is filled with powdered non-gas-forming pyrotechnic fuel composition.
Claim 12
Dependent Claim
65 words
The fuel composition load of claim 10 wherein said powdered non-gas-forming pyrotechnic fuel composition within the central openings of said fuel pellets comprises aluminum present in said composition in an amount of about 30% by weight and a metal oxide selected from the group consisting of ferric oxide, cupric oxide and mixtures thereof present in said composition in an amount of about 70% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |